implement the microsoft/gnu "__COUNTER__" macro: rdar://4329310

llvm-svn: 68933
diff --git a/clang/lib/Frontend/PCHReader.cpp b/clang/lib/Frontend/PCHReader.cpp
index b916dea..fa6ad6f 100644
--- a/clang/lib/Frontend/PCHReader.cpp
+++ b/clang/lib/Frontend/PCHReader.cpp
@@ -318,7 +318,11 @@
     switch (RecType) {
     default:  // Default behavior: ignore unknown records.
       break;
-        
+    case pch::PP_COUNTER_VALUE:
+      if (!Record.empty())
+        PP.setCounterValue(Record[0]);
+      break;
+
     case pch::PP_MACRO_OBJECT_LIKE:
     case pch::PP_MACRO_FUNCTION_LIKE: {
       IdentifierInfo *II = DecodeIdentifierInfo(Record[0]);